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Just for the heck of it I changed the thickness a bit and the color as you can see by the attached example I am still getting a thin black line above the red is that something different ? not part of the other stuff?

View a list of CSS properties for the selected element by opening the CSS panel and switching to the Computed tab. You can only see the computed style when a single element is selected.
If a property is set by a rule, an arrow displays next to the property name. Click the property to view the rule and the value that the rule specifies.
I would suggest you look at the CSS sections of Manual and visit https://www.welookups.com/css/default.html